Suction-producing device.



Y J. H. GOEHST a J. A. DUNLAP.

SUGTION PRODUCING DEVICE.

APPLIoATxoN FILED snPTxr, 1009.

Patented May 23, V1911.

2 B HEETSSHEBT i,

-' J/zn-J llaga" N J. H. GUBHST L J. A. DUNLAP.

SUGTION PRODUGING DEVICE.

APPLIOATTXON FILED SEPT. 7, 1909.

Patented May 23, 1911.

2 SHEETS-SHEET 2.

UNITED sTAgEs PATENT oEEIoE.

JOHN H. GOEHST AND JOHN A, DUNLAP, 0F CHICAGO, ILLINOIS, ASSIGNORS TO FED- ERAL ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATON OF ILLINOIS.

SUCTION-PRODUCING- DEVICE.

Specification of Letters Patent.

Patented May 23, 1 911.

Application filed September 7, 1909. Serial No. 516,584.

` reference being vhad to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to a rotaryl suction pump and comprises the matters hereinafter described and more particularly pointed out in the appended claims.

The pump is particularly ada table for use in vacuum cleaning devices an is highly efficient in producing the required vacuum for the operation of such a device with an expenditure of a minimum amount of energy. It is of simple and economical construction; is practically noiseless in running; and may be readily taken apart' for renewal or for repair of parts.

The various advantages will appear more clearly as we proceed with our specification.

In the drawings :-Figure 1 is a transverse, 'cross-section through the pump on a. plane through the axis of the entrance and discharge orifices of the pump. Fig. 2 is a vertical section through Fig. 1 on the line 2-2 thereof. Fig. 3 is a cross-section similar to Fig. 1 with the blades in a different position from that illustrated in Fig. 1. Fig. 4 is an end elevation of the blade carrying drum. Fig. 5 is a partial vertical section through Fig. el on the line 5 5 thereof.

Fig. 6 is a perspective view ofhone of the.

blades showing the rings by means of which it is mounted. Fig. 7 is e perspective view lof one of 4the rods which `slipport the blades in their operation.

The pump comprises inner and outer drums eccentrieally arranged, the outer surface of the inner drum having a line of contact with the inner surface of the outer drum ori-opposite sides of which line are located the entrance and discharge orifices. Said orifices communicate with the chamber formed between the drums. Fans or blades, arranged radially of the duter drum, are carried by the inner'drum and are adapted to swing through the chamber between said drums and push the air or other fluid in thev pump from the entrance orifice toward and out of the discharge orifice. In operation the blades or fans have a compressive action ou the air between them so as to more forcibly drive thc air through the ,discharge orifice.

In the drawings, A represents the inner drum, B the outer drum, andC C a pair of oppositely disposed blades or fans carried by the inner drum and adapted to sweep through the space betwen the inner and outer drums. The drum A consists of a cylindrical shell ce` closed at one end by a head al, preferably made integral therewith, and at its opposite end with a head a2 removably secured to the end of the cylindric shell. As illustrated in the drawings, said removable head c is provided with 'an annular shoul- 'der or rib a8 which engages in an annular groove cut in the face of a iiange a4 formed at the end of the cylindric shella. Hubs C1 C'2 are formed on the outer faces of the heads al a2, respectively, and a shaft C3 is rotatably mounted in said hubs. iVithi'n the druln A is located a cylindric cam c whichis keyed to the shaft C3 with its axis coincident with the axis of the outer drum B. The blades C C are operatively mounted on said cam by means of rings c1 c1 which are preferably made integral therewith. The cam und thesaid rings are so constructed relatively to each other and to the position of the shaft VC3 that the said blades or fans C C, in their operation, will revolve about the axis of the drum B as a center. Said fans or blades project' through slots c2 of" formed in ythe cylindric surface of the drum A and also through slotted rods E EPwhich are rotatively mounted in diametrically opposed bearings e" preferably formed integral with the cylindric walls of the drum The outer drum 'B comprises a cylindric shell B1 having formed integrally therewith4 an entrance orifice b1 and discharge orifice b2 and is closed at its opposite ends by means of plates b b4. The upper part of said drum 1s rovided with a supporting bracket J whlch is preferably formed integral therewith.

b5 b indicate eccentrically disposed hubs formed on the end plates b3 Within which are respectively journaled the hubs C1 Cz'of the inner drum A. In addition the ends of the drum A have bearing within ansov ci; Y 993,053

nular depressions formed on the inner faces of said lend plates b3 b4'. The shaft C3 is rigidly secured Within the hub b5. The hub C2 of the inner4 drum projects beyond the hub b of the outer drum and is there provided With a disk F to which are rotatably attached gears f forming part of a planetary system of gearing Gr operatively connected-With a driving shaft H.' The ldriving' shaft H may be driven by an electric motor or in any other convenient manner. c

K indicates a mul'lier Which is secured to the discharge orifice b2, in any convenient manner, as for example by means of the threaded thimble 7J. Said muliler consists of an inclo'sed-drum of larger diameter than the discharge'orifice, provided with a head K1, against which the discharge is directed, an

. inwardly turned flange K2 provided with openings K3 for the escape of the discharged air, and a'n internally disposed annular nipple 701 which serves for the'attachment of the muffler. 'Said niuilier is of simple construction and is quite efficient in preventing any puiiing noise in the action of the pump.

The end plate b4 ,is preferably provided with an annular flange P which is adapted `to inclose the planetary gearing and which may be secured to the casing P1 inclosing the motor, which drives the shaft II. l/Ve claim as our invention:-

1. In a suction pump of the class described,

in combination with an outer fixed drum, an

' inner rotatable drum eccentrically ournaled Within said outer drum and separated therefrom by a chamber, entrance and discharge orifices communicating with said chamber, a shaft keyed to thc outer drum with its axis coincident with the axis of rotation of the inner drum, a cam member secured to said shaft Within said .inner drum, said cam member having longitudinally spaced bearing rings concentric with said outerl drum, oppositely disposed blades carried by said inner drum, said blades projecting 'through the cylindric Walls of said inner drum and engaging the inner Walls of saidouter drum, longitudinally spaced rings secured to said blades, each ring of'one blade being mounted on one of said bearing rings and being located adjacent a ring of the opposite blade, and means for rotating said inner drum.

2. In a suction pump of the class described, in combination with an outer fixed drum, an inner rotatable drum eccentrically journaled Within said outer drum and separated therefrom by a chamber, said inner .drum comprising a cylindric shell, an inte gral head closing one end of said shell and a removable head vclosing the other end of said shell, entrance and discharge orifices communicating with said chamber, a shaft keyed to the outer drum With its axis coincident With the axis of rotation of the inner drum, a cam lmember secured to said shaft Within said inner drum, said cam member having longitudinally spaced bearing rings concentric with said outer'drum, oppositely disposed blades carried by said inner drum, ,longitudinally spaced rings secured to each blade, each ring of one blade being mounted on one of said bearing rings and being located adjacent a ring of the opposite blade,

yoppositely disposed slotted rods journaled 1n vk ..-M i 

